So after a short drive today the cinqs flat spot slash holding back lasted abit longer than usual and engine management light came on for afew seconds whats everyones thoughts please

Yes, diagnostics cable and software.

I have these but i thought they only worked when the light stayed on ??

No, any occuring error is stored until cleared with the diagnostics software. In newer ECUs (OBD standard etc.) they clear up themselves, but only after time, and not all of them. But you have a cinq, so SPI ECU, hence it will be there when you ask for faults in IAW ECU Scan 2.

Thanks woj